My fiancee called me out for mansplaining?

So, I've been dating her for about two years now and we got engaged about a month ago while visiting the Pacific Northwest. She's never expressed these feminist tendencies before. Basically, she was an art major in college, she's now attending PA school to be a physicians assistant. I commented on the facial structure of a boy in some obscure Central American painting, saying it greatly resembled the socialist realism found in Soviet paintings. I then began to explain what that was, just because I felt like it wasn't common knowledge and I forget that she was an art major -- we didn't know each other in college... she snapped at me and said that she knows more about socialist realism than me and, as a woman, is equally capable of understanding complex ideas. She then said that I was mansplaining a lot lately, ever since the engagement, and that I need to stop; its not okay for me to think less of her because she's a woman.

I was at a loss for words because this had never come up before. I just apologized for making her feel like I don't respect her and told her to let me know when she senses I'm being condescending. I didn't leave it at that, I told her that I don't think that calling me a "mansplainer" is fair because I tend to elaborate and explain my thoughts, regardless of who I'm talking to. She then began to cry and said "you don't know what its like to be a woman and have everyone disrespect you and talk down to you." I began to tense up, but inevitably affirmed her.

Did I handle this right? Should I be concerned about our future or talk about this more? I feel bothered, but think its not worth it.

Thoughts?